fredbi / uri / 6212441455

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enhancement: replaces regular expressions by explicit parsing following
the RFC grammar.

Replaced IPv6 parsing by standard lib functionality.

Overall, the benchmark shows a speed improvement of x5 when compared to
v0.1. This is still 2x slower than URL parsing with the standard libary.

This PR fixes a few strictness issues:
* identifies wrong URIs with empty authority and path starting with a
double '/'
* identifies invalid IPv6 addresses with an empty zone
* strictier check of DNS names
* strictier check of URL-encoded escape sequences
* allow escape sequences in IP addresses
* strictly follows the RFC rule: "if not a valid IP, then consider a
registered name": hence
* strictier IP kind distinction: IPv6 must be between [], IPv4 must not

Signed-off-by: Frédéric BIDON <fredbi@yahoo.com>

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